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A121951
Number of isomeric aza-benzenoids with three nitrogen atoms and n hexagons.
1
3, 14, 109, 730, 4918, 32043, 204417, 1277866, 7860506, 47678819
OFFSET
1,1
REFERENCES
N. Trinajstich, Z. Jericevic, J. V. Knop, W. R. Muller and K. Szymanski, "Computer generation of isomeric structures", Pure and Appl. Chem., vol. 55 (1983) pp. 379-390.
EXAMPLE
If n=5 then the number of isomeric aza-benzenoids with three nitrogen atoms is 4918. Here n is the number of hexagons.
CROSSREFS
Sequence in context: A246731 A349584 A258298 * A276751 A085244 A265001
KEYWORD
nonn
AUTHOR
Parthasarathy Nambi, Sep 04 2006
STATUS
approved